Housing Scams, Sinking Cities, Memory Proteins

10 million American households are behind on their rent or mortgage payments right now, and scammers are coming out of the woodwork. Also, why major cities are sinking all around the world. Then, what role proteins play in forming long-term memories in the brain while also causing memory loss diseases like Alzheimer’s. Additionally on today's show: how sleep researchers communicate with people inside their dreams, why engineers are making carbonated concrete, and how the increasingly noisy ocean poses a threat to marine life.